using (var cOntext= new AdventureWorks2008Entities()) { //var people = context.People.Where(c => c.LastName == "King").OrderBy(d => d.FirstName).Select(r => new { r.FirstName,r.LastName}); //var people = context.People.Where(c => c.LastName == "King").OrderBy(c =>c.FirstName).Select(c => new { c.FirstName, c.LastName }); var people = from per in context.People //join emp in context.Employees on per.BusinessEntityID equals emp.BusinessEntityID where per.LastName == "King" orderby per.FirstName select new { per.FirstName, per.LastName}; foreach (var person in people) { listBox1.Items.Add(string.Format("{0} \t \t {1} ", person.FirstName, person.LastName)); } }
Button2 LINQ TO ENTITYSQL
代码如下:
using (var cOntext= new AdventureWorks2008Entities()) { var str = "SELECT VALUE p FROM AdventureWorks2008Entities.People AS p WHERE p.LastName= @LastName Order by p.FirstName"; //var people = context.CreateQuery(str); var people = new System.Data.Objects.ObjectQuery(str, context); people.Parameters.Add(new System.Data.Objects.ObjectParameter("LastName", "King")); foreach (var person in people) { listBox2.Items.Add(string.Format("{0} \t \t{1}", person.FirstName, person.LastName)); } }
Button3 LINQ TO ENTITYCLIENT
代码如下:
var firstName = ""; var lastName = ""; using (EntityConnection cOnn= new EntityConnection("name=AdventureWorks2008Entities")) { string str = "SELECT p.FirstName, p.LastName FROM AdventureWorks2008Entities.People AS p WHERE p.LastName='King' Order by p.FirstName"; conn.Open(); EntityCommand cmd = conn.CreateCommand(); cmd.CommandText =str; using (EntityDataReader rdr = cmd.ExecuteReader(System.Data.CommandBehavior.SequentialAccess)) { while (rdr.Read()) { firstName = rdr.GetString(0); lastName = rdr.GetString(1); listBox3.Items.Add(string.Format("{0}\t \t{1}", firstName, lastName)); } } conn.Close(); } }